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This paper presents the system performance and flight testing of an advanced technology demonstrator for a low-cost and small size near-field obstacle warning sensor for civil and military helicopters. Based on the previously developed sensor modules, the complete sensor system was successfully tested during flight tests and the results of the visualization of various obstacles detected like antennas,...
A six port mixer based 20GHz nonlinear vector network analyzer (NVNA) dedicated to the characterization of radar power amplifier driven by non periodic pulsed signal is proposed. For the first time a mixer based NVNA is able to measure the fundamental and two harmonics simultaneously while using non periodic radar pulse train allowing measuring time domain waveforms and pulse to pulse measurement...
A fully printable 60 GHz chipless RFID tag provides high data capacity. The printed tag consists of an array of 45° inclined conductive microstrips that act as perfect electromagnetic (EM) polarizers. When illuminated with a linearly polarized signal, the tag's backscattered cross - radar cross section (RCS) response is much larger than its co-RCS. The tag can encode up to 50 bits of binary data in...
Position measurement plays an important role in industrial process technology. Hereby, a waveguide based position sensor system for industrial applications is described. The proposed system features a Phase Locked Loop controlled 24 GHz signal source, an interferometric Six-Port receiver structure, a radar coupler, and a terminated quasi-TEM parallel plate waveguide structure. Furthermore, the system...
In this paper, we present a system that allows to realize frequency-division multiplexing multiple-input multiple-output (MIMO) radars which are based on the frequency-modulated continuous-wave (FMCW) principle. Multiple frequency-shifted FMCW signals, which can be separated in the receiver, are used as transmit (TX) signals. The frequency shifting is implemented using digitally generated sinusoids...
MIMO radar imaging is receiving a substantial attention, thanks to its high resolution capacity. Whereas, the complexity and the cost of the active devices able to simultaneously transmit and receive signals of each antenna is a disincentive for the expansion of this technology, particularly using UWB signals. In this paper, a passive device is presented to achieve MIMO radar imaging using a single-port...
Detection sensitivity of a frequency-modulated continuous-wave (FMCW) radar can be limited by transmitter noise leaking into the receiver. For submillimeter-wave radars relying on high harmonic frequency-multiplication factors N>>1, phase noise typically dominates this leakage because it is amplified by 20log(N). A feed-forward phase noise cancellation circuit can suppress the effect of this...
Transmit and Receive (TX/RX) F-band radar modules are presented. Both modules are implemented in a state of the art SiGe:C BiCMOS featuring high-speed HBTs with fT/fmax of 300/500 GHz. The TX is based on a frequency octupler that consists of a cascade of three Gilbert cells, covering the upper F-band from 120–140 GHz and providing differential output power of up to 6 dBm, the highest values reported...
A high-output power and broadband GaN high electron mobility transistor (HEMT) has been developed for X-band applications. The device consists of 2-dice of 14.4-mm gate periphery together with input and output 2-stage impedance transformers. The device exhibited saturated output power of 310 W with power gain of 10.0 dB over the wide frequency range of 8.5–10.0 GHz, operating at 65 V drain voltage...
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